#!/usr/bin/env bash
set -euo pipefail

if [ -z "${PS1:-}" ]; then
    PS1=__dummy__
fi
CONDA_URL=https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh

if [ $# -gt 4 ]; then
    echo "Usage: $0 [output] [conda-env-name] [python-version>]"
    exit 1;
elif [ $# -eq 3 ]; then
    output_dir="$1"
    name="$2"
    PYTHON_VERSION="$3"
elif [ $# -eq 2 ]; then
    output_dir="$1"
    name="$2"
    PYTHON_VERSION=""
elif [ $# -eq 1 ]; then
    output_dir="$1"
    name=""
    PYTHON_VERSION=""
elif [ $# -eq 0 ]; then
    output_dir=venv
    name=""
    PYTHON_VERSION=""
fi

if [ -e activate_python.sh ]; then
    echo "Warning: activate_python.sh already exists. It will be overwritten"
fi

if [ ! -e "${output_dir}/etc/profile.d/conda.sh" ]; then
    if [ ! -e miniconda.sh ]; then
        wget --tries=3 "${CONDA_URL}" -O miniconda.sh
    fi

    bash miniconda.sh -b -p "${output_dir}"
fi

# shellcheck disable=SC1090
source "${output_dir}/etc/profile.d/conda.sh"
conda deactivate

# If the env already exists, skip recreation
if [ -n "${name}" ] && ! conda activate ${name}; then
    conda create -yn "${name}"
fi
conda activate ${name}

if [ -n "${PYTHON_VERSION}" ]; then
    conda install -y conda "python=${PYTHON_VERSION}"
else
    conda install -y conda
fi

conda install -y pip setuptools

cat << EOF > activate_python.sh
#!/usr/bin/env bash
# THIS FILE IS GENERATED BY tools/setup_anaconda.sh
if [ -z "\${PS1:-}" ]; then
    PS1=__dummy__
fi
. $(cd ${output_dir}; pwd)/etc/profile.d/conda.sh && conda deactivate && conda activate ${name}
EOF
